Riveting foil sticking control method based on foil guide strip pre-detection

Abstract

The invention discloses a riveting foil sticking control method based on foil guide strip pre-detection, and relates to the technical field of electronic component detection. The riveting foil sticking control method based on foil guide strip pre-detection comprises the following steps that S1, a test solution is prepared, and the test solution comprises dye, glycerin and phenol; s2, providing a test foil guide strip; s3, testing; s4, carrying out developing treatment; s5, foil sticking effect judgment: R is the percentage of the adhesion area of the test liquid to the surface contact area of the test foil guide strip; when R is larger than 95%, the judgment result is qualified, and the tested guide chaff directly enters the riveting process; and when R is less than 90%, the judgment result is unqualified, and the test guide chaff is abnormal in isolation analysis. According to the riveting foil sticking control method based on foil guide strip pre-detection, detection is carried out before the foil guide strip is arranged on the riveting and rolling machine, poor riveting foil sticking is avoided, and prevention and control over riveting foil sticking are achieved.

Description

Technical Field

[0001] This invention relates to the field of electronic component testing technology, and in particular to a riveting and foil adhesion control method based on pre-detection of guide foil strips. Background Technology

[0002] The conductive foil strip in soldered aluminum electrolytic capacitors is one of the key raw materials. Made of high-purity aluminum, it boasts low cost and high conductivity. Its role is crucial; acting as a metal lead, the foil strip is welded to the surface of the metallized aluminum foil, leading the internal electrodes of the capacitor to the external terminals, thus achieving circuit continuity. The foil strip is responsible for current transmission, ensuring efficient current conduction during charging and discharging, while also requiring low resistance to reduce losses. In high-temperature, high-humidity, or vibrating environments, the connection between the foil strip and the aluminum foil is critical to the long-term reliability of the capacitor. During capacitor riveting, the foil strip provides mechanical stability, helping to fix the internal structure and preventing misconnection or damage to the aluminum foil. Therefore, the foil strip is a key control item in the manufacturing process of soldered capacitors, and its characteristics directly affect the overall electrical parameters of the electrolytic capacitor.

[0003] The riveting effect of electrolytic capacitors typically requires disassembling the product after riveting to inspect the foil adhesion, which introduces lag and instability. Furthermore, current technologies usually employ the following methods to inspect foil riveting quality: 1. Visual inspection; 2. Ultrasonic testing; 3. Destructive sampling testing. Visual inspection suffers from a high rate of missed detections, ultrasonic testing is costly, and destructive sampling testing has a high scrap rate. Clearly, existing control methods cannot meet the requirements for accurate testing. Therefore, there is a need to find a riveting and foil adhesion control method based on pre-inspection of the foil, which allows for early detection of the foil adhesion surface performance, saving product inspection costs, resulting in more stable production, higher product quality, and more effectively meeting the increasingly demanding user needs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a riveting foil adhesion control method based on pre-detection of guide foil strips. This method is suitable for determining whether foil adhesion defects occur during the riveting process, solving the problem that the foil adhesion effect can only be checked after riveting in existing technologies, and improving the detection efficiency of foil adhesion effect.

[0005] A method for controlling riveting and foil adhesion based on pre-detection of guide foil strips is provided, including the following steps:

[0006] S1. Prepare the test solution, which includes dye, glycerol and phenol;

[0007] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil;

[0008] S3. Testing: Immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand. Then take out the test foil strip and perform development treatment.

[0009] S4. Development process: After the test foil strip is left to stand, observe the adhesion of the test solution to the test foil strip.

[0010] S5. Adhesion effect judgment: R is the percentage of the area adhered by the test liquid to the surface contact area of ​​the test foil strip; when R>95%, the judgment result is qualified, and the test foil strip directly enters the riveting process; when 90%≤R<95%, the judgment result is critical, and the test foil strip repeats steps S3 to S5 for secondary confirmation and retesting. If the judgment result of the retest is unqualified, the abnormality is isolated and analyzed. If the judgment result of the retest is qualified, the test foil strip enters the riveting process; when R<90%, the judgment result is unqualified, and the test foil strip is isolated and analyzed for abnormality.

[0011] Preferably, the guide foil is an aluminum foil with a surface coated with a metal oxide layer (aluminum oxide).

[0012] The process involves testing the foil strip using a test solution (step S1), following the testing procedure (step S3), and determining the criteria (step S5). If the foil strip is free of oil and other impurities, its surface is typically hydrophilic (especially the metal oxide layer). The aqueous solution can then spread evenly and penetrate the gaps between the foil strips, resulting in continuous staining. Conversely, if the surface of the foil strip contains hydrophobic organic matter, it will reduce its surface properties, causing the test solution to be repelled in contaminated areas, forming droplets or failing to wet the surface, thus leaving unstained patches.

[0013] Furthermore, in step S1, the test solution is composed of dye, distilled water, glycerol, phenol, and pure water.

[0014] Furthermore, in step S1, the test solution is composed of the following components by weight: 1-5 parts dye, 100-120 parts distilled water, 5-10 parts glycerol, 0.5-1 part phenol, and 30-50 parts pure water.

[0015] Furthermore, the dye is basic fuchsin or acid fuchsin.

[0016] Furthermore, in step S1, the test solution is composed of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water.

[0017] Furthermore, in step S2, the thickness of the test foil strip is 0.19-0.21 mm; the width is 4.95-5.05 mm; and the length is 49.9-50.1 mm.

[0018] Furthermore, in step S3, the test foil strip obtained in step S2 is immersed in the test solution obtained in step S1 and left to stand under conditions of relative humidity of 40-60% and temperature of 20-26℃.

[0019] Furthermore, in step S3, the test foil strip obtained in step S2 is immersed in the test solution obtained in step S1 and left to stand under the conditions of 40% relative humidity and 20°C.

[0020] Furthermore, in step S3, the test foil strip is vertically immersed in the test liquid and left to stand for 3-5 seconds.

[0021] Furthermore, in step S4, the test foil strip is left to stand for 5-8 seconds, and then the adhesion of the test liquid to the test foil strip is observed using an electron microscope.

[0022] Preferably, the static time for testing the guide foil strip in step S4 is 5 seconds.

[0023] Preferably, in step S4, a timer is used to control the resting time of the guide foil strip.

[0024] The test foil strip is left to stand so that the test liquid can flow naturally and spread fully on the test foil strip.

[0025] Preferably, in step S1, the method for preparing the test solution includes the following steps: mixing dye, distilled water, glycerol, phenol and pure water.

[0026] The beneficial effects of this invention are as follows:

[0027] This invention provides a riveting foil adhesion control method based on pre-inspection of guide foil strips. Specifically, it involves a method for detecting the surface cleanliness of guide foil strips through the penetration effect of test liquid. The detection is performed before the guide foil strip is rolled onto the riveting machine to avoid the occurrence of riveting foil adhesion defects, realize the prevention and control of riveting foil adhesion, reduce the waste of disassembling products after riveting, save product inspection costs, make production more stable, and improve product reliability. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a flowchart of the steps of the riveting and foil adhesion control method based on pre-detection of guide foil strip in Embodiment 1 of the present invention. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0034] To better understand the technical content of the present invention, the technical solution of the present invention will be further introduced and explained below with reference to specific embodiments.

[0035] In the embodiments and comparative examples of this invention, the conductive foil strips are all aluminum foils with a surface coating of a metal oxide layer (aluminum oxide).

[0036] Example 1

[0037] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0038] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0039] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0040] S3. Test: Under the conditions of 40% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0041] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope; the test foil strip is left to stand so that the test liquid can flow naturally and spread fully on the test foil strip.

[0042] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 99.3%, the determination result is qualified, and the test foil strip directly enters the riveting process. Figure 1 This is a flowchart of the steps of the riveting and foil adhesion control method based on pre-detection of guide foil strip in Embodiment 1 of the present invention.

[0043] Example 2

[0044] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0045] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0046] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0047] S3. Test: Under the conditions of 40% relative humidity and 26℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0048] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0049] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 99.1%, the determination result is qualified, and the test foil strip directly enters the riveting process.

[0050] Example 3

[0051] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0052] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0053] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0054] S3. Test: Under the conditions of 60% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0055] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0056] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 98.9%, the determination result is qualified, and the test foil strip directly enters the riveting process.

[0057] Example 4

[0058] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0059] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0060] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0061] S3. Test: Under the conditions of 60% relative humidity and 26℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0062] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0063] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 99.0%, the determination result is qualified, and the test foil strip directly enters the riveting process.

[0064] Example 5

[0065] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0066] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 1 part phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0067] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0068] S3. Test: Under the conditions of 40% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0069] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0070] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 98.6%, the determination result is qualified, and the test foil strip directly enters the riveting process.

[0071] Example 6

[0072] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0073] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 10 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0074] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0075] S3. Test: Under the conditions of 40% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0076] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0077] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 98.2%, the determination result is qualified, and the test foil strip directly enters the riveting process.

[0078] Example 7

[0079] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0080] S1. Prepare the test solution, which consists of the following components by weight: 5 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0081] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0082] S3. Test: Under the conditions of 40% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0083] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0084] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 98.9%, the determination result is qualified, and the test foil strip directly enters the riveting process.

[0085] I. The Influence of Phenol in the Test Solution

[0086] Comparative Example 1

[0087] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0088] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol and pure water.

[0089] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0090] S3. Test: Under the conditions of 40% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0091] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0092] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 80.3%, the determination result is unqualified, and the test foil strip is isolated and analyzed for abnormality.

[0093] Comparative Example 2

[0094] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0095] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.1 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0096] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0097] S3. Test: Under the conditions of 40% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0098] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0099] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 81.8%, the determination result is unqualified, and the test foil strip is isolated and analyzed for abnormality.

[0100] Comparative Example 3

[0101] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0102] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 8 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0103] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0104] S3. Test: Under the conditions of 40% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0105] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0106] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 86.1%, the determination result is unqualified, and the test foil strip is isolated and analyzed for abnormality.

[0107] The difference between Comparative Example 1 and Example 1 is that the test solution in step S1 does not contain phenol, while all other conditions are the same. The difference between Comparative Example 2 and Example 1 is that the weight of phenol in the test solution in step S1 is 0.1 parts, while all other conditions are the same. The difference between Comparative Example 3 and Example 1 is that the weight of phenol in the test solution in step S1 is 8 parts, while all other conditions are the same. From the perspective of foil adhesion effect, the weight of phenol in the test solution of the present invention is preferably 0.5-1 parts.

[0108] II. The Influence of Glycerol in the Test Solution

[0109] Comparative Example 4

[0110] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0111] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, phenol and pure water.

[0112] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0113] S3. Test: Under the conditions of 40% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0114] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0115] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 82.7%, the determination result is unqualified, and the test foil strip is isolated and analyzed for abnormality.

[0116] The difference between Comparative Example 4 and Example 1 is that the test solution in step S1 does not contain glycerin, while all other conditions are the same. From the perspective of foil adhesion effect, the test solution of this invention must contain glycerin.

[0117] III. Influence of Test Foil Strip Size

[0118] Comparative Example 5

[0119] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0120] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0121] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.1 mm; the width is 3.0 mm; and the length is 45 mm.

[0122] S3. Test: Under the conditions of 40% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0123] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0124] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 94.7%, the judgment result is critical, and the test foil strip repeats steps S3 to S5 for secondary confirmation and retesting. The retest confirms that the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 95.1%, the judgment result of the retest is qualified, and the process proceeds to the riveting process.

[0125] Comparative Example 6

[0126] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0127] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0128] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.5 mm; the width is 8.0 mm; and the length is 55 mm.

[0129] S3. Test: Under the conditions of 40% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0130] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0131] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 98.9%, the determination result is qualified, and the test foil strip directly enters the riveting process.

[0132] The only difference between Comparative Examples 5 and 6 and Example 1 is that the dimensions of the conductive foil strip are tested in step S2; all other conditions are the same. Based on the foil adhesion effect and subsequent performance tests, the thickness of the conductive foil strip used in this invention is preferably 0.19-0.21 mm; the width is preferably 4.95-5.05 mm; and the length is preferably 49.9-50.1 mm.

[0133] IV. The Influence of Test Temperature

[0134] Comparative Example 7

[0135] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0136] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0137] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0138] S3. Test: Under the conditions of 40% relative humidity and 18℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0139] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0140] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 89.1%, the determination result is unqualified, and the test foil strip is isolated and analyzed for abnormality.

[0141] Comparative Example 8

[0142] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0143] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0144] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0145] S3. Test: Under the conditions of relative humidity of 40% and temperature of 30℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0146] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0147] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 90.3%, the judgment result is critical, and the test foil strip repeats steps S3 to S5 for secondary confirmation and retesting. The retest confirms that the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 86.7%, the judgment result is unqualified, and the test foil strip is isolated for abnormal analysis.

[0148] The only difference between Comparative Example 7 and Example 1 is that the temperature tested in step S3 is 18°C; all other conditions are the same. The only difference between Comparative Example 8 and Example 1 is that the only difference is that the temperature tested in step S3 is 30°C; all other conditions are the same. From the perspective of foil adhesion effect, the temperature tested in step S3 of this invention is preferably 20-26°C.

[0149] V. The Influence of Test Humidity

[0150] Comparative Example 9

[0151] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0152] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0153] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0154] S3. Test: Under the conditions of 30% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0155] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0156] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip (R) is 92.6%, the judgment result is critical, and the test foil strip repeats steps S3 to S5 for secondary confirmation and retesting. The retest confirms that the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip (R) is 88.8%, the judgment result is unqualified, and the test foil strip is isolated for abnormal analysis.

[0157] Comparative Example 10

[0158] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0159] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol, phenol and pure water.

[0160] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0161] S3. Test: Under the conditions of 80% relative humidity and 20℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0162] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0163] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip (R) is 93.1%, the judgment result is critical, and the test foil strip repeats steps S3 to S5 for secondary confirmation and retesting. The retest confirms that the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip (R) is 89.8%, the judgment result is unqualified, and the test foil strip is isolated for abnormal analysis.

[0164] The only difference between Comparative Example 9 and Example 1 is that the relative humidity tested in step S3 is 30%, while all other conditions are the same. The only difference between Comparative Example 10 and Example 1 is that the only difference is that the relative humidity tested in step S3 is 80%, while all other conditions are the same. From the perspective of foil adhesion effect, the relative humidity tested in step S3 of this invention is preferably 40-60%.

[0165] VI. Synergistic Influence of Test Fluid and Test Conditions

[0166] Comparative Example 11

[0167] A method for controlling foil adhesion during riveting based on pre-detection of the guide foil strip includes the following steps:

[0168] S1. Prepare the test solution, which consists of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, and 30 parts pure water, wherein the dye is basic fuchsin; the preparation method of the test solution includes the following steps: mixing the dye, distilled water, glycerol and pure water.

[0169] S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil. The thickness of the test guide foil is 0.2 mm; the width is 5.0 mm; and the length is 50 mm.

[0170] S3. Test: Under the conditions of 80% relative humidity and 30℃, immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand for 3 seconds. Then take out the test foil strip and perform development treatment.

[0171] S4. Development process: After the test foil strip is left to stand for 5 seconds (the standing time is controlled by a timer), the adhesion of the test liquid to the test foil strip is observed with an electron microscope.

[0172] S5. Determination of foil adhesion effect: R is the percentage of the area of ​​test liquid adhesion to the surface contact area of ​​the test foil strip; at this time, the area of ​​test liquid adhesion to the surface contact area (R) of the test foil strip is 70.1%, the determination result is unqualified, and the test foil strip is isolated and analyzed for abnormality.

[0173] The only difference between Comparative Example 11 and Example 1 is that the test solution in step S1 does not contain phenol, and the relative humidity and temperature in step S3 are 30% and 30°C, respectively; all other conditions are the same. From the perspective of foil adhesion effect, this invention limits the conditions in the control method to ensure that the area of ​​the test solution adhering to the foil strip accounts for more than 95% of the surface contact area (R), thereby preventing poor foil adhesion during riveting.

[0174] Performance testing

[0175] One hundred guide foil strips were selected for performance testing after being processed by the riveting and foil adhesion control method based on guide foil strip pre-inspection / traditional visual inspection method. The minimum detectable abnormal size, single piece inspection time, missed detection rate, false judgment rate and riveting pass rate of the guide foil strips were tested respectively, and the average value was taken.

[0176] The performance of the guide foils processed by the riveting and foil adhesion control method based on guide foil pre-detection in Examples 1-7 was tested, and the test results are shown in Table 1 below:

[0177] Table 1. Performance test results of the guide foils treated by the riveting and foil adhesion control method based on guide foil pre-detection in Examples 1-7

[0178]

[0179]

[0180] The guide foils processed by the riveting and foil adhesion control method based on guide foil pre-detection in Comparative Examples 5-6 were subjected to performance tests. The test results are shown in Table 2 below:

[0181] Table 2 shows the performance test results of the guide foils after treatment with the riveting and foil adhesion control method based on guide foil pre-detection in Comparative Examples 5-6.

[0182] Testing items Comparative Example 5 Comparative Example 6 Minimum detectable anomaly size <![CDATA[0.2mm 2 ]]> <![CDATA[0.1mm 2 ]]> Single item inspection time 13s 12s False negative rate ＜2％ ＜1％ False positive rate ＜3％ ＜2％ Riveting qualification rate 95.0％ 98.80％

[0183] As can be seen from the test results in Table 1-2, if the riveting and foil-adhesive control method that does not perform pre-detection of the guide foil strip under the conditions specified in this invention is used, the effect of the treated guide foil strip is poor.

[0184] Comparison with traditional visual inspection methods:

[0185] Traditional visual inspection methods typically involve using a riveting machine to produce a capacitor core package, dissecting the core package, separating the guide foil from the aluminum foil, and visually inspecting the adhesion of the foil at the riveting joint. This invention, however, employs a pre-inspection method to control foil adhesion before the guide foil is loaded onto the machine, checking the adhesion of the test liquid.

[0186] Table 3 shows a comparison of the performance test results of the embodiments of the present invention with those of the traditional visual inspection method:

[0187] Table 3 Performance test results of the embodiments of the present invention and the traditional visual inspection method.

[0188]

[0189]

[0190] As shown in Table 3, the test results of this invention provide a riveting foil adhesion control method based on pre-detection of the guide foil strip. This method can meet testing requirements under different environments, improve test reliability, and ensure the stability of product riveting performance under various conditions. It also has the following advantages: Detection sensitivity: can identify 0.1mm. 2 Non-compliant areas; Detection consistency: Intra-batch coefficient of variation (CV) < 1.5%; Cost advantage: Cost per test < 0.5 yuan.

[0191] In summary, this invention provides a riveting foil adhesion control method based on pre-detection of the guide foil strip, which enables rapid pre-testing of the guide foil strip of aluminum electrolytic capacitors before use, preventing poor riveting foil adhesion, reducing the material cost of inspecting the riveting of disassembled capacitor products, and reducing the product failure and scrap cost caused by poor riveting due to abnormal guide foil strip.

[0192] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling riveting and foil adhesion based on pre-detection of guide foil strips, characterized in that, Includes the following steps: S1. Prepare the test solution, which includes dye, glycerol and phenol; S2. Provide test guide foil: Cut the guide foil to prepare the test guide foil; S3. Testing: Immerse the test foil strip obtained in step S2 into the test solution obtained in step S1 and let it stand. Then take out the test foil strip and perform development treatment. S4. Development process: After the test foil strip is left to stand, observe the adhesion of the test solution to the test foil strip. S5. Adhesion effect judgment: R is the percentage of the area adhered by the test liquid to the surface contact area of ​​the test foil strip; when R>95%, the judgment result is qualified, and the test foil strip directly enters the riveting process; when 90%≤R<95%, the judgment result is critical, and the test foil strip repeats steps S3 to S5 for secondary confirmation and retesting. If the judgment result of the retest is unqualified, the abnormality is isolated and analyzed. If the judgment result of the retest is qualified, the test foil strip enters the riveting process; when R<90%, the judgment result is unqualified, and the test foil strip is isolated and analyzed for abnormality.

2. The riveting and foil adhesion control method based on pre-detection of guide foil strips according to claim 1, characterized in that, In step S1, the test solution is composed of dye, distilled water, glycerol, phenol and pure water.

3. The riveting and foil adhesion control method based on pre-detection of guide foil strips according to claim 2, characterized in that, In step S1, the test solution is composed of the following components by weight: 1-5 parts dye, 100-120 parts distilled water, 5-10 parts glycerol, 0.5-1 part phenol, and 30-50 parts pure water.

4. The riveting and foil adhesion control method based on pre-detection of guide foil strips according to claim 3, characterized in that, The dye is basic fuchsin or acid fuchsin.

5. The riveting and foil adhesion control method based on pre-detection of guide foil strips according to claim 3, characterized in that, In step S1, the test solution is composed of the following components by weight: 2 parts dye, 100 parts distilled water, 5 parts glycerol, 0.5 parts phenol, and 30 parts pure water.

6. The riveting and foil adhesion control method based on pre-detection of guide foil strips according to claim 1, characterized in that, In step S2, the thickness of the test foil strip is 0.19-0.21 mm; the width is 4.95-5.05 mm; and the length is 49.9-50.1 mm.

7. The riveting and foil adhesion control method based on pre-detection of guide foil strips according to claim 1, characterized in that, In step S3, the test foil strip prepared in step S2 is immersed in the test solution prepared in step S1 and left to stand under the conditions of relative humidity of 40-60% and temperature of 20-26℃.

8. The riveting and foil adhesion control method based on pre-detection of guide foil strips according to claim 7, characterized in that, In step S3, the test foil strip prepared in step S2 is immersed in the test solution prepared in step S1 and left to stand under the conditions of 40% relative humidity and 20°C.

9. The riveting and foil adhesion control method based on pre-detection of guide foil strips according to claim 1, characterized in that, In step S3, the test foil strip is vertically immersed in the test liquid and left to stand for 3-5 seconds.

10. The riveting and foil adhesion control method based on pre-detection of guide foil strips according to claim 1, characterized in that, In step S4, the test foil strip is left to stand for 5-8 seconds, and then the adhesion of the test liquid to the test foil strip is observed using an electron microscope.

Images